Pyridinium-, 2-methylpyridinium-, and 2,6-dimethylpyridinium-1-thioacylaminides (5–7) were prepared from the corresponding unsubstituted pyridinium-1-aminides and methyl dithiocarboxylates in fairly good yields. The alkylation reaction of 5–7 took place exclusively on the thiocarbonyl sulfur, yielding pyridinium salts in quantitative yields. The NMR spectroscopic studies indicated that E and Z forms existed for these pyridinium salts. The thermal decomposition of 5–7 yielded the corresponding pyridine, nitrile, and sulfur in good yields.
以相应的未取代的
吡啶-1-酰胺和二
硫代
羧酸甲酯为原料,制备了
吡啶-1-酰胺、2-
甲基吡啶-1-酰胺和 2,6-二
甲基吡啶-1-
硫代
羧酸酰胺(5-7),收率相当高。5-7 的烷基化反应完全发生在
硫代羰基硫上,定量生成
吡啶鎓盐。核磁共振光谱研究表明,这些
吡啶鎓盐存在 E 和 Z 两种形式。5-7 的热分解产生了相应的
吡啶、腈和
硫,收率很高。